Tutorial by Examples: e

Declare JNDI resource in tomcat's server.xml, using the Tomcat JDBC connection pool: <GlobalNamingResources> <Resource name="jdbc/DatabaseName" factory="org.apache.tomcat.jdbc.pool.DataSourceFactory" auth="Container" ...

There are many ways to return a Date from a DateTime object SELECT CONVERT(Date, GETDATE()) SELECT DATEADD(dd, 0, DATEDIFF(dd, 0, GETDATE())) returns 2016-07-21 00:00:00.000 SELECT CAST(GETDATE() AS DATE) SELECT CONVERT(CHAR(10),GETDATE(),111) SELECT FORMAT(GETDATE(), 'yyyy-MM-dd') Note th...

ByVal keyword before method parameter (or no keyword as ByVal is assumed by default) says that parameter will be sent in a way not allowing the method to change (assign a new value) the variable underlying the parameter. It doesn't prevent the content (or state) of the argument to be changed if it'...

ByRef keyword before method parameter says that parameter will be sent in a way allowing the method to change (assign a new value) the variable underlying the parameter. Class SomeClass Public Property Member As Integer End Class Module Program Sub Main() Dim someInstance As ...

Pooling provides a higher level abstraction of the Worker functionality, including the management of references in the way required by pthreads. From: http://php.net/manual/en/class.pool.php Pools and workers provide an higher level of control and ease of creating multi-threaded <?php // T...

If you wish to make a complete backup of a large MySql installation and do not have sufficient local storage, you can dump and compress it directly to an Amazon S3 bucket. It's also a good practice to do this without having the DB password as part of the command: mysqldump -u root -p --host=localho...

The UMD (Universal Module Definition) pattern is used when our module needs to be imported by a number of different module loaders (e.g. AMD, CommonJS). The pattern itself consists of two parts: An IIFE (Immediately-Invoked Function Expression) that checks for the module loader that is being i...

Immediately invoked function expressions can be used to create a private scope while producing a public API. var Module = (function() { var privateData = 1; return { getPrivateData: function() { return privateData; } }; })(); Module.getPrivateData(); // 1 Module.priva...

AMD is a module definition system that attempts to address some of the common issues with other systems like CommonJS and anonymous closures. AMD addresses these issues by: Registering the factory function by calling define(), instead of immediately executing it Passing dependencies as an array...

CommonJS is a popular modularization pattern that's used in Node.js. The CommonJS system is centered around a require() function that loads other modules and an exports property that lets modules export publicly accessible methods. Here's an example of CommonJS, we'll load Lodash and Node.js' fs m...

Add the gradle dependency in app-level build.gradle compile 'com.android.volley:volley:1.0.0' Also, add the android.permission.INTERNET permission to your app's manifest. **Create Volley RequestQueue instance singleton in your Application ** public class InitApplication extends Application { ...

This example shows how to develop our first application step by step, assuming you already have Sails installed and a project created. Create an empty controller file by typing $ sails generate controller hello Find the new controller file at api/controllers/HelloControllers.js and add th...

Audio stream types There are different profiles of ringtone streams. Each one of them has it's different volume. Every example here is written for AudioManager.STREAM_RING stream type. However this is not the only one. The available stream types are: STREAM_ALARM STREAM_DTMF STREAM_MUSIC STR...

An example of "before" middleware would be as follows: <?php namespace App\Http\Middleware; use Closure; class BeforeMiddleware { public function handle($request, Closure $next) { // Perform action return $next($request); } } while &quot...

Here we have a class and we want the identity field (userUid) to have its value generated via a SEQUENCE in the database. This SEQUENCE is assumed to be called USER_UID_SEQ, and can be created by a DBA, or can be created by the JPA provider. @Entity @Table(name="USER") public class User...

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Iterator methods can be broken into two distinct groups: Adapters Adapters take an iterator and return another iterator // Iterator Adapter // | | let my_map = (1..6).map(|x| x * x); println!("{:?}", my_map); Output Map { iter: 1..6 } Note that the v...

If you want to remove calls to certain methods, assuming they return void and have no side affects (as in, calling them doesn't change any system values, reference arguments, statics, etc.) then you can have ProGuard remove them from the output after the build is complete. For example, I find this ...

For functions that need to take a collection of objects, slices are usually a good choice: fn work_on_bytes(slice: &[u8]) {} Because Vec<T> and arrays [T; N] implement Deref<Target=[T]>, they can be easily coerced to a slice: let vec = Vec::new(); work_on_bytes(&vec); le...

The following output equivalent results: class IfElseExample { public string DebugToString(object a) { if (a is StringBuilder) { return DebugToStringInternal(a as StringBuilder); } else if (a is List<string>) { ...